PURPOSE: To efficiently manufacture a medium or small welded shape whose size is deviated from the manufacturable range of a manufacturing equipment using a large I-beam manufacturing equipment.
CONSTITUTION: In a manufacturing method of a welded shape, a flange member 3 is assembled on each side of a web 1 using an I-beam manufacturing equipment 10 and welded to manufacture a large I-shape by using a steel plate having cut slit therein where a partially cut-and-left part is provided on the cutting line of the web 1 whose width is in the manufacturable range of the large I-beam manufacturing equipment 10. Then, a medium or small welded shape is manufactured by using the large I-beam manufacturing equipment where the flanges 3, 3 of a plurality of T-shapes obtained by cutting the cut-and-left part of the web 1 are restricted to each other in a back-to-back manner to be integrated, and another flange 3 is assembled to the end of the web 1 and welded to the web 1, and restriction of the flanges 3, 3 which are restricted to each other in a back-to-back manner is released and separated.
SEKIGUCHI NOBUO
ONO KOICHIRO
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